Simple Xml parse with Xdocument

Question

I want parse xml in windows store app with Xdocument.

I tried this,but returned with null:

XDocument xDoc;
string title= "";

xDoc = XDocument.Load(url);

var elements = from x in xDoc.Descendants()
               select new
               {
                   title = x.Descendants("title").First().Value,
               };

foreach (var el in elements)
    _title = title;

Xml contents:

<title type='text'>tiitle</title>
<content type='text'> gfgdgdggd</content>
<link rel='related' type='application/atom+xml' href='http....'/>

How can is retrive text from attributes ?

Please clarify - do you want the value of the title element, or the value of the type attribute. — user20416
– user20416, Commented Nov 19, 2012 at 0:22
Your XML is invalid. You need to have a single root element. — user20416
– user20416, Commented Nov 19, 2012 at 0:26

Damir Arh · Accepted Answer · 2012-11-20 06:05:58Z

3

As ZevSpitz already mentioned, your XML is invalid. I modified it a bit to be able to test my code:

<root>
    <title type="text">title</title>
    <content type="text">gfgdgdggd</content>
</root>

You can retrieve values from the type attributes with the following code:

XDocument xDoc = XDocument.Parse(xml);

var types =
    from x in xDoc.Root.Descendants()
    select x.Attribute("type").Value;

In my case xml is declared as follows:

private string xml =
    @"<root>
        <title type=""text"">title</title>
        <content type=""text"">gfgdgdggd</content>
    </root>";

You can still use your code to load the XML from a URL if the file contents are the same.

answered Nov 20, 2012 at 6:05

Damir Arh

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3 Comments

user20416 Over a year ago

Good call on using Root. I prefer not to use .Value, and instead cast to a string, because if there is no type attribute on the element the Attribute method will return null and calling the Value property will cause a NullReferenceException. If casting to string, the returned value will simply be null, which the string type can hold.

Damir Arh Over a year ago

@ZevSpitz I guess it depends on the expected XML structure, but I like your approach. I'm sure it'll come in handy. I usually used != null checking in such cases.

user20416 Over a year ago

How to: Retrieve the Value of an Element (LINQ to XML).

user20416 · Accepted Answer · 2012-11-18 23:59:52Z

0

Try:

var types =
    from e in xDoc.Descendants()
    select (string)e.Attribute("type");

foreach (string type in types) {
    Console.WriteLine(type);
}

answered Nov 18, 2012 at 23:59

user20416

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1 Comment

user20416 Over a year ago

Does it return null for all the elements? or only for one of them?

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